EP 0578400 A2 19940112 - Optical reflectometer.
Title (en)
Optical reflectometer.
Title (de)
Optischer Reflektometer.
Title (fr)
Reflectomètre optique.
Publication
Application
Priority
US 90776592 A 19920630
Abstract (en)
An improved optical low-coherence reflectometer[100,200,300,400] is disclosed for use in measuring the strength and location of optical reflections. The invention utilizes a reference signal comprising multiple copies of a light signal to increase the range of distance measurements over which the reflectometer[100, 200, 300, 400] operates. Each copy of the light signal is delayed by a different amount. Embodiments in which the copies are generated with a ring resonator[151,251], a Fabry-Perot cavity[351], and multiple fiber delay lines[350] are described. <IMAGE>
IPC 1-7
IPC 8 full level
G01B 9/02 (2006.01); G01M 11/00 (2006.01)
CPC (source: EP US)
G01M 11/3172 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5268738 A 19931207; DE 69302232 D1 19960523; DE 69302232 T2 19960919; EP 0578400 A2 19940112; EP 0578400 A3 19940126; EP 0578400 B1 19960417; JP H0666517 A 19940308
DOCDB simple family (application)
US 90776592 A 19920630; DE 69302232 T 19930621; EP 93304811 A 19930621; JP 18717893 A 19930630